More than in previous albums already superb, and always with the flute and piano, Ian Anderson pushed the cap until invite a violin string quartet, to confront the maximum saturation of a Gibson Martin Barre became very virtuoso on the matter. A paid audacity and rarely reaches the summit so far, in this wonderful exchange, performed brilliantly, combining the softness of classical music with the power of a hard rock dice more flamboyant. This masterpiece of Jethro Tull, remains one of the best rock albums "baroque progressive".